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make sure that promoteds which fail to evaluate in dead const code behave correctly #80696

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Jan 5, 2021
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make sure that promoteds which fail to evaluate in dead const code behave correctly #80696

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15 changes: 13 additions & 2 deletions src/test/ui/consts/promotion.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,12 +4,23 @@

fn foo(_: &'static [&'static str]) {}
fn bar(_: &'static [&'static str; 3]) {}
fn baz_i32(_: &'static i32) {}
fn baz_u32(_: &'static u32) {}
const fn baz_i32(_: &'static i32) {}
const fn baz_u32(_: &'static u32) {}

const fn fail() -> i32 { 1/0 }
const C: i32 = {
// Promoted that fails to evaluate in dead code -- this must work
// (for backwards compatibility reasons).
if false {
baz_i32(&fail());
}
42
};

fn main() {
foo(&["a", "b", "c"]);
bar(&["d", "e", "f"]);
assert_eq!(C, 42);

// make sure that these do not cause trouble despite overflowing
baz_u32(&(0-1));
Expand Down